Operator

..<(_:)

Returns a partial range up to, but not including, its upper bound.

Declaration

prefix static func ..< (maximum: Measurement<UnitType>) -> PartialRangeUpTo<Measurement<UnitType>>

Parameters

maximum

The upper bound for the range.

Discussion

Use the prefix half-open range operator (prefix ..<) to create a partial range of any type that conforms to the Comparable protocol. This example creates a PartialRangeUpTo<Double> instance that includes any value less than 5.0.

let upToFive = ..<5.0

upToFive.contains(3.14)       // true
upToFive.contains(6.28)       // false
upToFive.contains(5.0)        // false

You can use this type of partial range of a collection’s indices to represent the range from the start of the collection up to, but not including, the partial range’s upper bound.

let numbers = [10, 20, 30, 40, 50, 60, 70]
print(numbers[..<3])
// Prints "[10, 20, 30]"

See Also

Operating on a Measurement

static func != (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether two values are not equal.

static func <= (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether the value of the first argument is less than or equal to that of the second argument.

static func > (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether the value of the first argument is greater than that of the second argument.

static func >= (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether the value of the first argument is greater than or equal to that of the second argument.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software